Exhaust gas purification system of working machine
First Claim
1. An exhaust gas purification system comprising:
- a common rail engine mounted to a working machine;
an exhaust gas purification device coupled to an exhaust system of the common rail engine;
at least one throttle device comprising an intake air throttle device and an exhaust gas throttle device coupled to intake and exhaust systems of the common rail engine; and
an ECU configured to operate the common rail engine in;
an auxiliary renewing mode in which a temperature of exhaust gas is raised based on actuation of the at least one throttle device,a forced renewing mode in which a fuel is supplied to the common rail engine using an injection timing based on a post injection time; and
a mode selection input means which, in a case that a clogged state of the exhaust gas purification device is equal to or greater than a first prescribed level, is configured to indicate a mode selection between the auxiliary renewing mode or the forced renewing mode;
wherein;
in a case that an accumulated drive time of the common rail engine exceeds a set time, the forced renewing mode is executed regardless of the clogged state of the exhaust gas purification device; and
in a case that the accumulated drive time of the common rail engine is less than the set time and the clogged state of the exhaust gas purification device is greater than or equal to the first prescribed level, either the auxiliary renewing mode or the forced renewing mode is executed based on the indicated mode selection of the mode selection input means; and
when the clogged state of the exhaust gas purification device is not improved after execution of the auxiliary renewing mode, the forced renewing mode is executed regardless of the indicated mode selection of the mode selection input means.
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Accused Products
Abstract
An exhaust gas purification system of a working machine is operable to reduce a loss of a working time caused by a point that it takes a long time to renew an exhaust gas purification device by throttle devices. The exhaust gas purification system of the working machine is provided with a common rail type engine which is mounted to the working machine, an exhaust gas purification device which is arranged in an exhaust system of the engine, and at least one of the intake air throttle device and the exhaust gas throttle device. It is provided with mode selection input means which selects whether an auxiliary renewing mode is executed or a forced renewing mode is executed in the case that a clogged state of the exhaust gas purification device is equal to or more than a prescribed level.
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Citations
17 Claims
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1. An exhaust gas purification system comprising:
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a common rail engine mounted to a working machine; an exhaust gas purification device coupled to an exhaust system of the common rail engine; at least one throttle device comprising an intake air throttle device and an exhaust gas throttle device coupled to intake and exhaust systems of the common rail engine; and an ECU configured to operate the common rail engine in; an auxiliary renewing mode in which a temperature of exhaust gas is raised based on actuation of the at least one throttle device, a forced renewing mode in which a fuel is supplied to the common rail engine using an injection timing based on a post injection time; and a mode selection input means which, in a case that a clogged state of the exhaust gas purification device is equal to or greater than a first prescribed level, is configured to indicate a mode selection between the auxiliary renewing mode or the forced renewing mode; wherein; in a case that an accumulated drive time of the common rail engine exceeds a set time, the forced renewing mode is executed regardless of the clogged state of the exhaust gas purification device; and in a case that the accumulated drive time of the common rail engine is less than the set time and the clogged state of the exhaust gas purification device is greater than or equal to the first prescribed level, either the auxiliary renewing mode or the forced renewing mode is executed based on the indicated mode selection of the mode selection input means; and when the clogged state of the exhaust gas purification device is not improved after execution of the auxiliary renewing mode, the forced renewing mode is executed regardless of the indicated mode selection of the mode selection input means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An exhaust gas purification system comprising:
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a common rail engine coupled to a work machine; an exhaust gas purification device coupled to the common rail engine and configured to receive an exhaust gas; and a throttle device comprising an intake air throttle or an exhaust gas throttle; and an ECU configured to operate the common rail engine in; a normal mode; an auxiliary renewing mode in which a temperature of the exhaust gas is raised based on actuation of the throttle device; and a forced renewing mode in which a fuel is supplied to the common rail engine using an injection timing based on a post injection time; wherein the ECU is further configured to; determine whether a work portion of the work machine is in an operation state or a non-operation state; based on a determination that the work portion is in the non-operation state, select an operation mode of the common rail engine as one of the auxiliary renewing mode or the forced renewing mode based on a particulate matter level of the exhaust gas purification device being greater than or equal to a first prescribed level; based on a determination that the work portion is in the operation state; prohibit operation of the auxiliary renewing mode regardless of whether the particulate matter level of the exhaust gas purification device is greater than or equal to the first prescribed level; generate an output to indicate the auxiliary renewing mode is not executed based on the work portion being in the operation state; start a timer; and enable an operation of the auxiliary renewing mode after a value of the timer is greater than or equal to a predetermined time. - View Dependent Claims (10, 11)
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12. An exhaust gas purification system comprising:
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a common rail engine coupled to a work machine; an exhaust gas purification device coupled to the common rail engine and configured to receive an exhaust gas; a throttle device comprising an intake air throttle or an exhaust gas throttle; and an ECU configured to operate the common rail engine in; a normal mode; an auxiliary renewing mode in which a temperature of the exhaust gas is raised based on actuation of the throttle device, and a forced renewing mode in which a fuel is supplied to the common rail engine using an injection timing based on a post injection time; wherein the ECU is further configured to; in response to a first particulate matter level of the exhaust gas purification device being greater than or equal to a first prescribed level, identify a selected mode between the auxiliary renewing mode or the forced renewing mode; and based on a temperature of the exhaust gas being less than or equal to a prescribed temperature for an entirety of predetermined period of time, execute the auxiliary renewing mode regardless of the selected mode. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification